If the store is open I'll always sell inside, however when it is closed I'll just use the box. I like to fish at night so its useful to be able to sell them when the store is closed. However, I'm so surprised how many people actually save all their fish/bugs for CJ and Flick! I never do that, it's just a bonus to me if I happen to get some expensive fish/bugs on the day that they are in town!